1 RCA 40KG6A PL509 Power pentode. Grey plates with halo getters.  Made in Holland.  Took a picture of the code on the lower portion

Tests at 101%.  Strong life test, no shorts or grid emissions indicated on a B&K 747b mutual conductance tester.

Any test above 55% is considered passing on this tester and the theoretical new tube will  test between 100-120%

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If no box is shown they will ship in a vintage box from another manufacturer.

Satisfaction guaranteed.  Any issues contact me directly for a solution.  

Discount combined shipping on multiple tube purchases.  Wait for a invoice or I can refund the difference.

Thanks for looking!